<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>更新时的一个问题</title>
   
</head>
  <!--引入开发版本Vue-->
  <script type="text/javascript" src="../js/vue.js"></script>
<body>

    
    <!-- 准备好一个容器 -->
    <div id="root">
          <!-- 遍历数组 -->
          <h2>人员列表</h2>
          <button v-on:click.once="updateMei()">更新马冬梅的信息</button>
         <ul>
            <li v-for="(p,index) of persons" :key="index">
             {{p.name}} - {{p.age}}-{{p.sex}}
           </li>
         </ul>
    </div>
</body>

<script type="text/javascript">
    Vue.config.productionTip = false //阻止 vue 在启动时生成生产提示
    
   const vm =  new Vue({
      el:document.getElementById('root'),
      data:{
         persons:[
              {id:'001', name:'马冬梅',age:18,sex:'女'},
              {id:'002', name:'周冬雨',age:28,sex:'女'},
              {id:'003', name:'周杰伦',age:38,sex:'男'},
              {id:'004', name:'温兆龙',age:38,sex:'男'}
         ]
      },
      methods: {
         updateMei(){
            console.log('调用了');
            // this.persons[0].name='马老师'//奏效
            // this.persons[0].age='79'//奏效
            // this.persons[0].sex='未知'//奏效
            this.persons.splice(0,1,{id:'001', name:'马老师',age:18,sex:'男'})
         }
      },


    });
  
    console.log(vm);



</script>

</html>